LED Light Source for Microscope

LED Light Source for Microscope

Here is an economical way to experiment with light, color, and optics. You get one Red LED light source, one Green LED light source, and one Blue LED light source. The three LEDs can be controlled independently of each other, and this can be used as a light source in microscopes. From Optical physics (and as shown by Maxwell), it is with our knowledge that there are three types of primary colors, namely, Red,Green and Blue (RGB). Any other color of whatever shade may be produced by mixing appropriate propotions of these three primary colors!

Schematic of the Microscope LED Light Circuit

Parts list

S1: SPST On/Off Switch
D1: 1N 4007
C1: 100nF
IC1: LM317T
C2: 10uF/16V
R1: 220 R
R2: 680R
R3: 270R, R5: 120R , R7: 120R / R4,R6,R8: 10K
P1,P2,P3: 10K Multi-turn POTs
LED1, LED 2, LED3 : 5mm Red x1, 5mm Green x1 , 5mm Blue x1
T1,T2,T3: STP60NF06 MOSFETs

As shown in the photograph, the three LEDs can be fitted in a small piece of (~ 60mm x40mm) veroboard. This allows easy placement of the unit on the top of the glass specimen carrier (incase of a space restriction , try to use a trimmed down version of the board). The ring is nothing but a plastic one with near 25mm outer diameter and 10mm height, directly glued on the top of the PCB. If available, use a black ring rather than a white one. Similarly, try to use “diffused” LEDs, or carefully convert the existing LEDs to diffused LEDs with the help of some sandpaper/similar abrasive material. Rest of the circuit should be enclosed in a small box, and use suitable wires/cable for interconnection between the LED board and the “Driver” box.

The circuit can be powered from any good-quality 9 to 12VDC power supply, thanks to the onboard 5V regulator wired around LM317 (IC1).The potentiometers P1, P2 and P3 (in connection with mosfets T1,T2 and T3) allow the intensity of each color to be individually adjusted, while S1 acts as the master on/off switch.

Notes

High-Intensity,Diffused LEDs are good for this circuit
Literally, “Giant” Power Mosfets are used here. This is an intentional implementation to increase the circuit flexibility
Due to component tolerance, it may become necessary to alter the values of resistors R3 to R8
This is an Unorthodox & Generic” Design. Be prepared to carry out some experimenting to get the results you want!

About Unknown

Gallery of Free Electronic Circuits Diagrams You can find here Thousands of circuits Diagrams without any cost it's totally free with full of help and we provide you also latest circuits diagrams.